core/services/unread.py

import json

from services.redis import redis


async def get_unread_counter(chat_id: str, author_id: int) -> int:
    unread = await redis.execute("LLEN", f"chats/{chat_id}/unread/{author_id}")
    return unread or 0


async def get_total_unread_counter(author_id: int) -> int:
    chats_set = await redis.execute("SMEMBERS", f"chats_by_author/{author_id}")
    unread = 0
    for chat_id in list(chats_set):
        n = await get_unread_counter(chat_id.decode("utf-8"), author_id)
        unread += n
    return unread